UdG users
1945-06-06 Letter
1946-03-08 Letter
1949-02-17 Letter
1949-03-11 Letter
1950-03-25 Letter
1950-08-17 Letter
1951-03-26 Letter
1951-05-25 Letter
1951-05-26 Letter
1951-10-10 Letter
1951-11-26 Letter